Transcript
ESTIMATION & PREPARATION OF BILL OF QUANTITIES
Training Module on Estimation & Preparation of Bill of Quantities
A
Guidelines for the preparation of BOQs and Estimates for Improvements & Maintenance of Rural Roads
A.1
Introduction Improvements to rural roads could be categorized into two: 1. Improvements to surface & drainage systems only 2. Improvements to geometry, widening, surfacing and drainage. At this stage we have to presume, that our local bodies have their own priority lists indicating which roads to be surfaced and which are to be improved. For both cases you need a ground survey plan of the road with information such as existing edges, shoulder edges and drains delineated separately. Once you are equipped with this information it is recommended to follow the following steps for the category 1 improvement work. 1. 2. 3. 4. 5. 6. 7.
Fix a horizontal alignment, almost following the existing Centre line Mark the change at 20m interval Get cross sections with sufficient widths to LHS and RHS Plot the vertical alignment at 20m interval and smooth it out presuming a desirable filling rather than appreciating cuts. Once vertical alignment is done, then get the designed left/right edge readings. Plot cross-sections at 20m intervals and indicate existing profile and designed profile. Once the above basic ground information is completed you are equipped to prepare working drawings and you have a systematic methodology to evaluate the quantities.
We as road engineers and technical personals have to be very careful and methodical in administrating road construction works, as it has always been the case to exceed the quantities causing unrealistic cost over runs. We must minimized the variations and for this to be done methodologically we need the above sated ground information well before we prepare the BOQ & estimate. Alternatively, it has been the conventional practice to have an visual inspection and then to prepare the BOQs. There is no doubt visual inspection is an very important aspect, we must carry out prior to the preparation a BOQ but estimation of quantities can only be carried out based on ground survey data stated above.
A.2
Important aspects we should looked into in a visual inspection
A.3
Get an idea of the general cross section of the road Assess to which degree the pavement is failed, failure type and how? Whether the side drains are functioning, what has gone wrong with them? Assess the structural soundness of the cross drainage structures? Get an idea about the traffic volume and as well as the type of traffic? Possible sections where mud slides, land slides and rock falls are possible? Get an idea about the availability of good gravel and aggregate sources in close vicinity to the road? General Notes (a) (b) (c) (d) (e) (f) (g)
Following general information and norms are very much useful to arrive at quantities, to formulate specifications and to develop construction work programs.
A.3.1
Concrete works
Cement : Road Authorities recommends Sansta, Ruhunu and Mitsui brands for structural concrete and masonry works.
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Training Module on Estimation & Preparation of Bill of Quantities
A.3.2
Earthworks and Compaction
A.3.3
The rate for aggregate compaction should normally include the cost for watering too. The average rate of traveling of a oil/diesel roller is 20km per day.
Asphalt Concrete (Hot mix / Cold mix)
A.3.5
Compacted and loose volume ratios for 95% and 100% densities are 1:35 and 1:42 respectively. The normal output of earth compaction using 8-10 Ton roller is approximately 3 66m per day. 3 When the compaction width is less than 1.5m, the output reduces to 50m per day.
Aggregates and Compaction
A.3.4
For cement concrete pre-cast products: Road Authorities recommends SEC, SDCC and RCDC products. For all RCC or grade concrete use concrete mixer, if the volume involved is > 3 3m . Use weight batch mixes for all concrete above grade 25. Batching of materials in the field under average conditions will be in the proportions 1:21/2:4 by volume to obtain the nominal mix of cement concrete 1:2:4 19mm) For 1:3:6 (37.5mm) and 1:4:8 (50mm) mixes you may continue to be batched by volume in the specified nominal proportions.
For estimation purposes it is recommended to adopt a compacted density 3 equal to 1.25MT/m . But for actual payments design densities should be used. Average density of asphalt premix in loose state can be assumed as 1.48 3 MT/m . 3 3 Quantity of aggregate required for m of asphalt premix is 0.6270m . Quantity of CSS-1 (Emulsion) required for 1MT of cold mix is 59.17 litter.
Quantities of Components for Cement Concrete and Cement Mortars used for Road Works. Grade
Yield Unit
Cement concrete Ditto Ditto
G40 (19mm)
M
G30 (19mm) G25(19mm)
M 3 M
3
8.12 6.35
0.60 0.60
0.91 0.90
Ditto
G25 (37.5mm 7% + 19mm 30% G20 19mm) 1:1:5:3(19mm) 1:2:4(19mm) 1:2:4 (37.5 mm) 1:3:6(19mm) 1:4:4(50mm) 1:2 mix
M
3
5.86
0.57
M 3 M 3 M 3 M 3 M 3 M Sq.m
3
5.65 8.12 5.65 4.38 4.38 3.18 0.1
0.60 0.60 0.60 0.60 0.60 0.60 0.013
37.5=0.54 19=0.24 0.90 0.91 0.90 1.00 0.91 1.00 1.00
1:2 mix
Sq.m
0.23
0.020
-
Ditto Ditto Ditto Ditto Ditto Ditto 12.5mm Ct. render 19mm Ct. render
3
Cement in 50 bags 9.87
3
Description
Sand m
0.60
Aggregate / 3 Rubble m 0.91
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Training Module on Estimation & Preparation of Bill of Quantities
12.5mm Ct. render 19mm Ct. render RRM in Ct. mortar
A.4
1:3 mix
Sq.m
0.12
0.016
-
1:3 mix
Sq.m
0.19
0.024
-
1:6 mix
M
1.77
0.40
1.10
3
Examples A standard Bill of Quantities (BOQQ) for a rehabilitation road will normally have work items under following phases. (a) Preliminary (b) Site Clearing (c) Earthworks (d) Construction of Sub-base, Bases and Shoulders (e) Surface Applications & Surfacing (f) Drainage Construction (g) Incidental Construction (h) Structures - Slab Culverts - Box Culverts - Pipe Culverts - Bridges - Retaining Walls/ Toe Walls - Gabion Walls (i) Day works
A.4.1
Standard Bill of Quantities for a Rural Road
A.5
Preparation of a BOQ for sand sealing treatment
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Training Module on Estimation & Preparation of Bill of Quantities
ANNEX - 1
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Training Module on Estimation & Preparation of Bill of Quantities
BILL OF QUANTITIES WIDENING & IMPROVEMENTS TO ………….ROAD/IMPROVEMENTS TO INTERSECTIN OF
BILL NO. 01 – PREMILINARIES Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
1.1 1.1.2 1.3
--
Allow for mobilization
Item
Lump Sum
Allow for demobilisation
Item
Lump Sum
Item
Prov. Sum
305(A) Existing utilities and utility diversions
1.4
Provide Office for the Engineer
Month
1.4.1
Maintain Office for the Engineer
Month
1.5
Provide House for the Engineer
1.5.1
Maintain House for the Engineer
1.6 1.5.1
Provide Furniture for the Engineer's House and Office
Item
Office consumables for the Engineer
1.7
Stationery and other services including water, electricity and telephone for the Engineer.
1.8
Engineer's technical and clarical staff
Amoun t Cts.
Rs.
Prov. Sum Month
Item
Prov. Sum
1. Clerk/Typist
Month
2. Computer Operator
Month
3. Licensed Surveyor/Engineer (Intermittent)
Month
4. Office Aide
Month
5. House Servent / Watcher
Month
6. Chainmen
Day
1.9
Provide and maintain vehicle for the Engineer
Veh. Week
1.10
Allow for maintenance of the road surface during the construction period as directed.
Week
1.11
Allow for water sprinkling
Week
1.12
Allow for safety of road users including watching, lighting and barricading.
Month
1.13
Provision of project name boards as directed by the Engineer.
02
Nos.
1.14
Survey equipment for the Engineer
Item
Lump Sum
6
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
1.15
Survey cross sections, preparation of drawings and setting out & levelling.
Item
Lump Sum
1.16
Provide monthly Progress Report & Final Report and as built drawings, to Engineer.
Item
Prov. Sum
Bill No. 01 Carried to Summary:
BILL NO. 02 – SITE CLEARING Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
2.1
2.2
Amoun t Cts.
Rs.
Cts.
Allow for demolishing existing buildings, parapet walls, fences etc., and removal of obstructions and objectionable materials in preparing right of way. 202(1) 201(2) Allow for clearing the right of way including removal and disposal of all trees, stumps, roots, vegetation and other obstructions as directed.
Item
Prov.Sum
Item
Prov.Sum
Bill No. 02 Carried to Summary: BILL NO. 03 - EARTH WORKS Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
3.1
--
Amoun t Cts.
Rs.
Cts.
Supplying and laying approved quality geotextile fabric on prepared surface of marshy ground as directed. Sq.m.
3.2
--
Supplying and spreading sand, forming a sand blanket on the geotextile fabric as directed. Cu.m.
3.3
304(2) Supplying, spreading and compacting approved soil on the sand blanket for forming lower embankment as per specification. Cu.m.
3.4
304(2) Supplying, spreading and compacting approved soil on lower embankment forming upper embankment as per specification. Cu.m.
3.5
--
Supplying and spreading of pervious material of specified gradation to from a continuous drainage layer of …..mm thick as directed. Cu.m.
3.6
301(1) Roadway excavation in loose /ordinary / medium / hard unclssified soil including removal of unclassified material from the site. Cu.m.
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Training Module on Estimation & Preparation of Bill of Quantities
3.7
301(3) Roadway excavation in soft rock.
Cu.m.
3.8
301(3) Roadway excavation in rock requiring blasting.
Cu.m.
3.9
304(3) Trimming, levelling and compaction of original ground to 100% standard density.
Sq.m.
3.10
408(3) Scarifying existing depth by roller.
Sq.m.
3.11
304(2) Soil sub grade material spread & compacted in position Type II embankment material as per specification.
road surface to 50mm
Cu.m 3.12
601(1) Soil sub grade material spread & compacted in position Type II embankment material as per specification (material available at site) ) Cu.m Bill No. 03 Carried to Summary:
BILL NO. 04 - CONSTRUCTION OF SUB BASES, BASES & SHOULDERS Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
Amoun t Cts.
Rs.
Cts.
401(1) Approved soil sub base Type I material spread & compacted in position as per specification. 4.1
Cu.m. 401(1) Approved soil sub base Type II material spread & compacted in position, as per specification.
4.2
Cu.m. 405(1) Supplying, spreading and compacting graded aggregate (37.5mm) to form a dense graded aggregate base as per specification.
4.3
Cu.m. Bill No. 04 Carried to Summary :
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Training Module on Estimation & Preparation of Bill of Quantities
BILL NO. 05 - SURFACE APPLICATIONS AND SURFACINGS
Item No. Pay Item
Descript ion
Qty
Unit
Rate
Amou nt
Rs. 5.1
Rs.
Cts.
Application of prime coat using bitumen emulsion CSS-1 at the rate of 1.0Ltr/Sq.m, as per specification. 501(2) 504(1) Sand sealing using emulsion CRS-1 orCRS-2 at the rate of 0.8 Ltr/Sq.m as per specification.
Sq.m. Sq.m.
5.3
502(2) Application of tack coat using bitumen emulsion CSS-1 or CSS-2 at the rate of 0.4Ltr/Sq.m as per specification.
Sq.m.
5.4
407 (1) Supply and laying of bitumen bound base (37.5mm), as per specification.
M.T
5.5
Asphalt concrete binder course, as per specification.
5.2
Cts.
506(1) 5.6
M.T Asphalt concrete wearing course, as per specification.
506(1)
M.T Bill No. 05 Carried to Summary:
BILL NO. 06 - DRAINAGE CONSTRUCTION Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
Amount Cts.
Rs.
Cts.
Excavation for built up drains in unclassified soil & backfilling. 6.1 6.2
701(1) 701(1) Excavation for earth drains in unclassified soil (cutting measurement).
Cu.m.
Cu.m. 6.3
1008(2) Supplying and fixing 25mm thick planks and struts of Class II timber as formwork rough finish, in foundation of built up drains including removing.
6.4
1008(1) Supplying and fixing smooth shuttering of Class II timber as formwork complete with props etc. for concreting walls of built up drains including removing.
Sq.m.
Sq.m. 6.5
1001(3) Class C concrete nominal mix 1:3:6 (37.5mm) as screed to the foundation.
6.6
1001(2) Class B concrete grade 25 (19mm) foundation slabs & walls of built up drains.
Cu.m. in Cu.m.
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Training Module on Estimation & Preparation of Bill of Quantities
6.7
1002(1) Fabricate and lay tor steel reinforcement in built up drains.
bars as M.T
6.8
1002(1) Fabricate and lay mild steel bars as reinforcement in built up drains.
6.9
701(3)
M.T. RandomRubble masonry using 150-225mm rubble in cement sand mortar 1:5 mix for R R masonry drains. Cu.m. 6.10
1006(3) Plastering 19mm thick in cement sand mortar 1:3 mix (smooth finish) in exposed surfaces of R R masonry walls. Cu.m.
6.11
704(1) Laying & joining 300/450/600mm dia. concrete pipes for under ground drainage, as per specification.
6.12
1012(6) Supplying and laying reinforced concrete cover slabs class B concrete grade 25 (19mm) for built up drains , including loading and unloading (size of the slab. ………………..m.)
6.13
703(4) Construction of kerb inlets, Type KI/P/T1, KI/P/T2 , KI/P/T3 as per drawing No. SD 2/1, SD 2/2, SD 2/3.
6.14
703(4) Construction of kerb inlet, type KI/T1 as per drawing No. SD 2/4.
6.15
703(4) Construction of kerb inlets, Type KI/M/T1, KI/M/T2 as per drawing No. SD 3/1, SD 3/2.
L.m
Nos.
Nos.
Nos.
Nos. 6.16
703(4)
Construction of kerb inlet, Type CM/T1 as per drawing No. SD 3/3.
Nos.
Laying & joining 225mm dia concrete pipes from kerb inlet to flumes as out lets, as per specification. 6.17
704(1)
L.m. Construction of standard paved flumes at outlet of kerb inlets, as per drawing.
6.18
--
Nos. Construction of catchpit (size … .m)
6.19
703(3)
6.20
703(1)
Nos. Construction of manhole (size ……m) Nos. Bill No. 06 Carried to Summary:
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Training Module on Estimation & Preparation of Bill of Quantities
BILL NO. 07 - INCIDENTAL CONSTRUTION Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
7.1 7.2 7.3 7.4 7.5 7.6 7.7
810(1) 811(1) ----808(1)
7.8
801(2)
7.9
802(1)
7.10
802(2)
Application of road markings, as per specification. Providing & erecting road signs, as per specification. Providing & erecting kilometer posts, as per Drawing No. Providing & erecting RDA boundary markers, as directed and as per Drawing No. Providing & erecting standard type guard stones, as per Drawing No. Construction of access roads as directed. Providing & erecting standard type guard rails, as per specification. Top soiling of embankment slopes where turfing necessary. Turfing by sprigging. Turfing by seeding.
Item
Prov.Sum
Item
Prov.Sum
Item
Prov.Sum
Item
Prov.Sum
Item
Prov.Sum
Item
Prov.Sum
Amou nt Cts.
Rs.
L.m. Cu.m. Sq.m. Sq.m.
Turfing by sodding (solid/strip/spot) 7.11
802(3)
Sq.m. Provision of street lighting system ( single sided/ opposite sided / staggered /centre median arrangement) with high pressure sodium vapour lamps with lumen output of ……….. lumens at ………….W including necessary fittings as per drawings & specifications.
7.12
1013(1)
Nos. Supply and laying double arm / single arm standard type road kerbs in raised footwalks/ centre median/center island/splitter islands/traffic islands and bus bays (125mm wide and 900mm long) set on 19mm thick 1:3 cement sand mortar layer on 150mm x 275mm wide nominal mix 1:2:4 (19mm) concrete foundation with average 157mm x 150mm wide backing with same concrete including excavation and shuttering, as per specification.
7.13
807(1)
L.m Supplying, spreading and compacting approved soil on raised footwalks/center median/traffic islands, as directed.
7.14
7.15
806(2) 806(1)
Cu.m Supplying & laying of 450 x 450 x 50mm precast concrete slabs on raised footwalks centre median/traffic islands including average 40mm thick sand/cement mortar bedding, as per specification. Sq.m.
11
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
806(1)
Paving of raised footwalks/ side walks/ shoulders with bituminous surfacings (SBST, DBST, Asphalt concrete cold mix, asphalt concrete hot mix), as per specification.
7.16 7.17
Sq.m. 808(1)
Supplying and fixing pedestrian guard rails.
L.m.
Bill No. 07 Carried to Summary:
BILL NO. 08 - STRUCTURES Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
Amou nt Cts.
Rs.
Slab Culverts Demolition & removal of existing culvert foundations in the areas where new foundations to be constructed and clearing. 8.1
202(1)
Item
Prov.Sum
Excavation for foundations in unclassified soil & backfilling of structures, as per specification. 8.2
302(1)
Cu.m. Preparation of base of foundation
8.3
302(5)
Item
Prov.Sum
Item
Prov.Sum
Dewatering 8.4
302(7) Supplying hot rolled mild steel dowels, 1m long spliced & dove tailed at one end and fixing in 16/29/25mm dia, bore holes to 0.3m depth.
8.5
1005(7)
No. Supplying and fixing 25mm thick planks & struts of Class II timber as formwork rough finish, in foundations of abutments and wing walls including removing.
8.6
1008(2)
Sq.m. Supplying and fixing smooth shuttering of Class II timber as formwork complete with props etc. for abutments, wingwalls, capping beams & slabs including removing.
8.7
1008(1)
Sq.m. Class C cement concrete nominal mix 1:3:6 (37.5mm) as screed to the foundation slabs of abutments and wing walls.
8.8
1001(3)
Cu.m. Class C cement concrete nominal 1:3:6(37.5mm) in foundation slabs.
8.9
1001(3)
mix
Cu.m.
12
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
Class B cement concrete grade 25 (19mm) in foundation slabs. 8.10
1001(2)
Cu.m. Class C cement concrete nominal mix (37.5mm) in abutments / wing walls.
8.11
1:3:6
1001(3)
Cu.m. Class B cement concrete grade 25, (19mm) abutments and wing walls.
8.12
in
1001(2)
Cu.m. Random Rubble masonry using 150-225mm rubble in cement sand mortar 1:3 mix for abutments, wing walls and parapet walls.
8.13
1006(1)
Cu.m. Plastering 19mm thick in cement sand mortar 1:3 mix (smooth finish) in exposed surfaces of walls.
8.14
1006(3)
Cu.m. Class A cement concrete grade 25 (19mm) for capping beams & slabs.
8.15
1001(1)
Cu.m. Tor steel as reinforcement for foundation slabs / abutments / wing walls / capping beams & slabs.
8.16
1002(1)
M.T. Mild steel as reinforcement for foundation slabs / abutments / wing walls/ capping beams & slabs.
8.17
1002(1)
M.T. Forming weep holes in abutments and wing walls using P.V.C. pipes of int. dia. not less than 75mm complete with dripledge and surround finished smooth.
8.18
706(1)
L.m. Clay puddled and laid behind abutments and wing walls.
8.19
705(3)
Sq.m. 50-200mm aggregate backfilling behind abutments and wing walls.
8.20
705(1)
Cu.m. Supplying and packing 75mm thick 40mm stone filter layer behind dry stone lining.
8.21
705(2)
Cu.m. Providing & erecting standard type guard stones as directed.
8.22
808(2)
No. Widening of existing slab culvert at Chainage ……...
8.23
--
Item No. Pay Item
Prov.Sum Descript ion
Qty
Unit
Rate Rs.
Amoun t Cts.
Rs.
13
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
Box Culverts Demolition & removal of existing culvert foundations in the areas where new foundations to be constructed and clearing. 8.24
202(1)
Item
Prov.Sum
Excavation for foundations in unclassified & backfilling of structures as per specification. 8.25
302(1)
Cu.m. Preparation of base of foundation
8.26
302(5)
Item
Prov.Sum
Item
Prov.Sum
Dewatering 8.27
302(7) Supplying and fixing smooth shuttering of Class II timber as formwork complete with props etc. for box culvert including removing.
8.28
1008(1)
Sq.m. Class C cement concrete nominal mix, 1:3:6(37.5mm) as screed to the base slab of box culvert.
8.29
1001(3)
Cu.m. Class A cement concrete grade 25 (19mm) in walls of box culvert.
8.30
1001(1)
Cu.m. Class C cement concrete nominal mix, 1:3:6 (37.5mm) in wing walls / Concrete parapet walls.
8.31
1001(3)
Cu.m. Random Rubble masonry using 150-225mm rubble in cement sand mortar 1:3 mix for wing walls.
8.32
1006(1)
Cu.m. Plastering 19mm thick in cement sand mortar 1:3 mix (smooth finish) in exposed surfaces of walls.
8.33
1006(3)
Cu.m. Tor steel as reinforcement.
8.34
1002(1)
M.T. Mild steel as reinforcement.
8.35
1002(1)
M.T. Forming weep holes in box culvert walls and wing walls using P.V.C. pipes of int. dia. not less than 75mm complete with dripledge and surround finished smooth.
8.36
706 (1)
L.m. Clay puddled and laid behind box culvert walls (as directed).
8.37
705(3)
Cu.m. 50-200mm aggregate backfilling behind box culvert walls.
8.38
705(1)
Cu.m.
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Training Module on Estimation & Preparation of Bill of Quantities
Supplying and packing 75mm thick 40mm stone filter layer behind dry stone lining. 8.39
705(2)
Cu.m. Providing & erecting guard stones as directed.
8.40
808(2)
Nos. Widening of existing box culvert at Chainage ……..
8.41
--
Item No. Pay Item
Descript ion
Item
Prov.Sum
Qty
Unit
Rate Rs.
Amoun t Cts.
Rs.
Pipe Culverts
Demolition & removal of existing culverts in the areas where new culverts to be constructed and clearing. 8.42
202(1)
Item
Prov.Sum
Excavation of trench for laying of pipes in unclassified soil and backfilling as per specification. 8.43
302(1)
Cu.m. Preparation of base.
8.44
302(5)
Item
Prov.Sum
Item
Prov.Sum
Dewatering 8.45
302(7) Supplying, Laying & joining 600/900/1200mm dia. concrete pipes.
8.46
707(3)
L.m. Supplying and fixing 25mm thick planks & struts of Class II timber as formwork rough finish, in foundations of head walls &end walls including removing.
8.47
1008(2)
Sq.m. Supplying and fixing smooth shuttering of Class II timber as formwork complete with props etc. for end walls & head walls including removing.
8.48
1008(1)
Sq.m. Class C cement concrete nominal mix 1:3:6(37.5mm) as screed to the foundation slabs.
8.49
1001(3)
Cu.m.
15
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
Class C cement concrete nominal mix (37.5mm) in foundation slabs.
8.50
1:3:6
1001(3)
Cu.m. Class C cement concrete nominal mix 1:3:6 (37.5mm) in head walls & end walls.
8.51
1001(3)
Cu.m. Random Rubble masonry using 150-225mm rubble in cement sand mortar 1:3 mix for head walls & end walls.
8.52
1006(1)
Cu.m. Plastering 19mm thick in cement sand mortar 1:3 mix (smooth finish) in exposed surfaces of walls.
8.53
1006(3)
Cu.m. Forming weep holes in head walls & end walls using P.V.C. pipes of int. dia. not less than 75mm complete with dripledge and surround finished smooth.
8.54
706(1)
Cu.m. Clay puddled and laid behind end walls & head walls.
8.55
705(3)
Cu.m. 50-200mm aggregate backfilling behind end walls & head walls.
8.56
705(1)
Cu.m. Supplying and packing 75mm thick 40mm stone filter layer behind dry stone lining.
8.57
705(2)
Cu.m. Providing & erecting standard type guard stones as directed.
8.58
808(2)
Nos. Widening of existing pipe culvert at Chainage ……….
8.59
--
Prov.Sum Bridges
-Widening of existing bridge at Chainage ………. 8.60
--
Item
Prov.Sum
Item
Prov.Sum
Qty
Unit
Construction of new bridge at Chainage …... 8.61
--
Item No. Pay Item
Descript ion
Rate Rs.
Amoun t Cts.
Rs.
Retaining Walls/ Toe Walls Excavation in unclassified soil for foundation and backfilling as per specification. 8.62
302(1)
Cu.m.
16
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
Preparation of base of foundation 8.63
302(5)
8.64
302(7)
Dewatering.
Item
Prov.Sum
Item
Prov.Sum
Supplying hot rolled mild steel dowels, 1m long spliced & dove tailed at one end and fixing in 16/20/25mm dia. bore holes to 0.3m depth. 8.65
1005(7)
No. Supplying & fixing 25mm thick planks and struts of Class II timber as formwork rough finish, in foundation including removing.
8.66
1008(2)
Sq.m. Supplying and fixing smooth shuttering of Class II timber as formwork complete with props etc. for concrete retaining walls/toe walls including removing.
8.67
1008(1)
Sq.m. Class C cement concrete nominal mix 1:3:6(37.5mm) as screed to the foundation slabs of retaining walls.
8.68 8.69
1001(3) 1001(3)
Cu.m. Class C cement concrete nominal mix (37.5mm). in retaining walls/toe walls.
1:3:6 Cu.m.
Class B cement concrete grade 25 (19mm) in retaining walls/toe walls. 8.70
1001(2)
Cu.m. Random Rubble masonry, 150-225mm rubble in cement sand mortar 1:5 in retaining walls/toe walls.
8.71
1006(1)
Cu.m. Plastering 19mm thick with cement sand motar 1:3 mix (smooth finish) in exposed surfaces of retaining walls/toe walls.
8.72
1006(3)
8.73
1002(1)
8.74
1002(1)
Sq.m. Tor steel as reinforcement.
M.T.
Mild steel as reinforcement.
M.T.
Forming weep holes in retaining walls using P.V.C. pipes of int. dia. not less than 75mm complete with dripledge and surround finished smooth. 8.75 8.76 8.77
706(1) 705(3) 705(1)
L.m. Clay puddled and laid behind retaining walls/toe walls.
Cu.m.
50-200mm aggregate backfilling behind retaining walls/toe walls.
Cu.m.
Supplying & packing '75mm thick 40mm stone filter layer behind dry stone lining. 8.78
705(2)
Cu.m. Providing & erecting guard stones as directed.
8.79
808(2)
Item No. Pay Item
Nos.
Descript ion
Qty
Unit
Rate Rs.
Amoun t Cts.
Rs.
17
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
Gabion Walls Excavation in unclassified soil for foundation & backfilling as per specification. 8.80
302(1)
Cu.m Preparation of base of foundation
8.81
302(5)
Item
Prov. Sum
Item
Prov. Sum
Dewatering 8.82
302(7) Supplying & fixing 25mm thick planks and struts of Class II timber as formwork rough finish, in foundation including removing.
8.83
1008(2)
Sq.m. Class C cement concrete nominal mix 1:3:6(37.5mm) as screed to the foundation slabs of gabion walls.
8.84
1001(3)
Cu.m Class C cement concrete nominal mix (37.5mm) in foundation slabs.
8.85
1:3:6
1001(3)
Cu.m Class B cement concrete nominal mix 1:2:4 (19mm) in foundation slabs.
8.86
1001(2)
Cu.m Construction of gabion wall using 4x1x1m / 4 x1x 0.5m mesh on prepared ground / on foundation slab.
8.87
805(1)
Cu.m Providing & erecting guard stones as directed.
8.88
808(2)
Nos. Bill No. 08 Carried to Summary:
BILL NO - 09 – DAYWORKS
Item No. Pay Item
Descript ion
Qty
Unit
Rate Rs.
Amoun t Cts.
Rs.
ALL QUANTITIES ARE PROVISIONAL 9.1 9.1.1 9.1.2
Labour (Sri Lankan Nationals) Foreman Site Surveyor
Day Day
Skilled Equipment Operator 9.1.3 9.1.4 9.1.5 9.1.6 9.1.7 9.1.8
Day Semi Skilled Equipment Operator Driver (Heavy Duty Vehicle) Driver (Light Duty Vehicle) Mechanic Skilled workman
Day Day Day Day Day
18
Cts.
Training Module on Estimation & Preparation of Bill of Quantities
9.1.9 9.1.10
Semi Skilled workman Labourer
Day Day
Labour Sub Total (Carried Forward) Note: Rates shall apply to Sri Lankan Nationals Tenderers intending to utilise Foreign National Labour shall submit a schedule of rates for such categories of labour that may be employed.
9.2
Equipment Capacities detailed for items refer to fly wheel power ratings, carrying capacities of trucks, Manufacturer's ratings or maximum recommended loads etc.
9.2.1 9.2.2 9.2.3 9.2.4 9.2.5 9.2.6 9.2.7 9.2.8 9.2.9 9.2.10 9.2.11 9.2.12 9.2.13 9.2.14 9.2.15 9.2.16 9.2.17 9.2.18 9.2.19 9.2.20 9.2.21 9.2.22 9.2.23 9.2.24 9.2.25 9.2.26
Motor Grader from 50 to 100 HP Wheeled Excavator Over 50 HP(Back hoe) Highway Tipper Lorries up to 5 tons Highway Tipper Lorries From 5 to 10 tons Porker Vibrator Plate Vibrator Vibrating Rammer(60kg) Vibrating Roller(1/2-1 ton) Vibrating Roller(smooth 10 tons) Pneumatic Tired Roller up to 8 tons Pneumatic Tired Roller 8-12 tons Pneumatic Tired Roller- over 12 tons Smooth Road Roller(8-10tons) Water Bowser(4000litres) Baby Dumper Wheel loader ( 2.70 to 3.1 Cu.m) Asphalt Paver (Crawler) Bitumen Distributor(4000 liters) Bitumen Sprayer Sand/Chip Spreader(Propelled 4000 liters) Sand/Chip Spreader- towed Asphalt/Concrete Mixer (4000 Liters) Concrete Mixer with weight batcher 114/10 Water Pump 100mm Water Pump 50mm Tractor and Trailer
Hour Hour km km Hour Hour Hour Hour Hour Hour Hour Hour Hour km Hour Hour Hour Hour Hour Hour Hour Hour Hour Hour Hour Hour
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Training Module on Estimation & Preparation of Bill of Quantities
9.2.27 9.3 9.3.1 9.3.2 9.3.3 9.3.4 9.3.5 9.3.6 9.3.7
Welding Plant with Generator set Material (Base Cost) Prime Coat Cut back MC 30 Tack Coat Cut Back RC Bitumen 80/100 PEN Cationic Bitumen Emulsion CRS II Asphalt concrete surfacing material binder 6% mixdense (19mm) Asphalt concrete bound base material binder 3.53% mix-dense (37.5mm) Diesel
Hour
Litre Litre Litre Litre M.Ton M.Ton Litre
Crushed Aggregates for PC and Asphalt Concrete 9.3.8 9.3.9 9.3.10 9.3.11 9.3.12 9.3.13 9.3.14
Cu.m Natural washed fine aggregate for PC and Asphalt Concrete Portland Cement Reinforcing Mild Steel Grade 250 Reinforcing High Yield Grade 460/425 Dense graded aggregate for road base. Timber Class II of Sri Lankan Timber Corporation or equivalent
Cu.m Bag(50kg) M.Ton M.Ton Cu.m Cu.m
Percentage on Materials to cover overheads , profits and all other costs applicable to Materials in Bill Items in 9.3 Bill No. 09 Carried to Summary:
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Training Module on Estimation & Preparation of Bill of Quantities
A.6
Preparation of a BOQ for Sand sealing Treatment
(a)
How do we carry out a sand sealing treatment?
Because it is a surface treatment, it won’t correct any surface irregularities, as such prior to carry out a sand sealing treatment it is required to correct the pavement for proper center and also to regulate drainage. Example 1: Observe the Fig. 01 and recommend, the course of steps to be taken prior to commence a sand sealing treatment. Fig: 01: The typical situation of a metal and tared road-C class
Observations
Obviously the road pavement has structurally failed probably due to excessive axle loads. As such prior to carry out a sand sealing treatment, the pavement has to be rectified. Once it is rectified you still need to attend following tasks prior to carry out the sand sealing treatment.
Ensure a pavement cross should not be less than 4.0% Ensure a shoulder cross fall should not be less than < 5% Cleaning of all chocked culverts & deepening of existing side drains.
Hence a BOQ for sand sealing of this particular road section should include the above major improvement tasks as well. The trainer is expected to explain in detail means of estimating quantities for above tasks we identified prior to carryout the sand sealing task.
The Annex 2 provides a typical list of activities involved in a sand sealing treatment.
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Training Module on Estimation & Preparation of Bill of Quantities
ANNEX - 2
22
Training Module on Estimation & Preparation of Bill of Quantities
A.6.1 A typical BOQ for sand sealing will comprised with the following work items. Item No. 1
2
3
4
5
Description
Unit
Cleaning desilting existing drain and lead up drains to proper shape & gradient and transport of excavated materials from road side up to 100m. Cleaning choked culverts (with head room >1m) if the culvert head room is <1m work shall be carried out on day works basis.
Lm
Cutting scupper drains on any soil other than rock to an average width of 0.75m with proper gradient and an average depth of 100mm. Correction of corrugations, depressions and cambering road surfaces using asphalt concrete compacted by vibrating roller including internal transport. Sand sealing with emulsion CRS-2 at the rate of 0.8/sqm using plant, & blinding with sand at the rate of 125 Sqm per Cum including internal transport.
Lm
Rate
Quantity
Amount
Amount
Total
M.ton
Sqm
A typical BOQ for Rural Road District
:
Gampaha
Region
:
Negombo
Electorate
:
Ja-Ela
Estimate
:
Work description This estimate includes all expenditure in respect of materials labour & equipment
Prepared by : Checked by:
Metal & faring Narangoda Road
Quantities
Item Item Nos. (1) to (9)
Price
Contingency
Engineer Provincial Council Negombo
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Training Module on Estimation & Preparation of Bill of Quantities
The estimate
The BOQ
Item No. 01
02
03
04 05 06
07
08 09
Description of work
Unit
Supplying & filling of 4” aggregate including transport Supplying & filling of 1 ½” aggregate including transport Supplying & filling of ¾” aggregate including transport Spreading of 4” aggregate & compaction Spreading of 1 ½” and ¾” aggregate & compaction Application of a first coat at 2 the rate of 3l/m and blinding with sand nd Application of the 2 coat 2 at the rate of 1.252/m and blinding with sand. Allow for transport of bitumen Allow for transport of road roller
M
3
M
3
M
3
Quantity
Price
Total
3
M
3
M
2
M
2
M
Barrels Days
24
